Composite electromagnetic stirrer suitable for casting blanks with different squares and circles

Abstract

The utility model discloses a composite electromagnetic stirrer suitable for casting blanks with different sizes and circles. The composite electromagnetic stirrer comprises a rotating magnetic field sensor and a traveling wave magnetic field sensor which are adjacently arranged in the continuous casting direction of the casting blanks, the rotating magnetic field inductor comprises first yoke iron, the first yoke iron is a circular ring or a square ring, N rectangular first iron cores are uniformly arranged on the inner wall of the first yoke iron, and rotating magnetic field excitation coils are wound on the first iron cores; the traveling wave magnetic field inductor comprises connecting iron cores and second yoke irons, the connecting iron cores are circular rings or square rings, M second yoke irons are evenly arranged between the two connecting iron cores in the perimeter direction, m second iron cores are evenly arranged on the inner walls of the second yoke irons in the casting blank continuous casting direction, and traveling wave magnetic field excitation coils are wound on the second iron cores. The stirrer generates a multi-dimensional composite magnetic field in a casting blank liquid core, the electromagnetic thrust direction and magnitude of each dimension can be adjusted in real time according to the process, the temperature of melt in a casting blank and the uniformity of solute are improved, and the stirring efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting magnetoelectric equipment, in particular to a composite electromagnetic stirrer suitable for casting billets with different radiuses. Background Art

[0002] With the rapid development of my country's steel industry, continuous casting machines used in the industry have also developed accordingly, along with the continuous development of electromagnetic stirrer technology. The function of the electromagnetic stirrer inductor is to generate an alternating magnetic field when three-phase or two-phase alternating current is applied. The alternating magnetic field induces a current in the liquid metal. The liquid metal with the induced current is subjected to a force in the magnetic field, causing a stirring motion, thereby improving the internal structure of the ingot.

[0003] my country is currently developing from a major steel producer to a leading steel power, placing higher demands on steel performance and, consequently, electromagnetic metallurgical processes. Conventional electromagnetic stirrers can only generate a single-dimensional stirring force within the liquid core of the ingot, resulting in a very limited stirring effect and unable to effectively eliminate the various metallurgical quality issues encountered during the liquid core solidification process.

[0004] In the prior art, patent CN115533058A discloses a composite side-spiral electromagnetic stirring device; CN101700477B discloses a multi-mode magnetic field electromagnetic stirrer. Both patents disclose stirring devices that combine the output function of rotating and traveling-wave electromagnetic forces. However, the excitation coils of the rotating magnetic field are placed before or after the excitation coils of the traveling-wave magnetic field, and the rotating magnetic field and traveling-wave magnetic field excitation coils share a set of iron cores. In actual implementation, due to the layout direction of the iron core laminations, at least one set of excitation coils will always induce long-path eddy currents in the iron core laminations, resulting in greater core losses and lower overall efficiency of the electromagnetic stirrer.

[0005] Patent CN107116191B discloses a composite spiral electromagnetic stirrer capable of outputting both rotating and traveling electromagnetic forces. The rotating magnetic field excitation coil and the traveling magnetic field excitation coil are placed on an arc of the same radius in the same horizontal space. In practice, this solution is limited by the shape and internal space of the electromagnetic stirrer. The traveling magnetic field excitation coil occupies the space already reserved for the rotating magnetic field excitation coil, limiting the combined power of the rotating and traveling magnetic field excitation coils and preventing the simultaneous output of both the rotating and traveling magnetic fields.

[0006] Patent CN118699305A discloses an electromagnetic flow control method for reducing inclusions in small-sized ingots. The electromagnetic stirrer's structure is similar to a conventional E-shaped rotary electromagnetic stirrer. A yoke end with an inclination angle of θ is positioned near the inner cylinder of the core teeth. This guides the magnetic circuit to produce a certain angle with respect to the horizontal, thereby generating Z-direction thrust. In practice, this solution cannot flexibly adjust the rotational thrust and Z-direction thrust to meet on-site process requirements due to the fixed inclination angle of the yoke end.

[0007] Therefore, the existing technology has the shortcomings of low stirring efficiency, limited power output, and limited stirring process. It is necessary to develop a composite electromagnetic stirrer that is suitable for ingots of different shapes and has higher stirring efficiency and adjustment flexibility.

[0008] It should be noted that the above introduction to the technical background is merely intended to provide a clear and complete description of the technical solutions of this application and facilitate understanding by those skilled in the art. Simply because these solutions are described in the background technology section of this application, it should not be assumed that the above technical solutions are well known to those skilled in the art. Utility Model Content

[0009] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a composite electromagnetic stirrer suitable for billets of different sizes. By separately arranging a rotating magnetic field sensor and a traveling wave magnetic field sensor, the composite stirrer can be flexibly applied to square or round billets, generating a composite magnetic field of multiple dimensions in the liquid core of the billet, and having high stirring efficiency.

[0010] In order to achieve the above object, the utility model provides a composite electromagnetic stirrer suitable for billets of different radius, comprising a rotating magnetic field sensor and a traveling wave magnetic field sensor adjacently arranged along the billet continuous casting direction;

[0011] The rotating magnetic field sensor includes a first choke, which is a circular ring or a square ring. The inner wall of the first choke is evenly provided with N rectangular first iron cores, and the first iron cores are each wound with a rotating magnetic field excitation coil to generate a rotating magnetic field;

[0012] The traveling wave magnetic field sensor includes a connecting iron core and a second yoke iron, wherein the connecting iron core is a circular ring or a square ring, and the two connecting iron cores are symmetrically arranged in the upper and lower directions. M second yoke irons are evenly arranged between the two connecting iron cores along the circumference direction. The inner wall of the second yoke iron is evenly arranged with m second iron cores along the continuous casting direction of the ingot, and the second iron cores are each wound with a traveling wave magnetic field excitation coil to generate a traveling wave magnetic field;

[0013] Wherein N, M, and m are all integers greater than or equal to 2.

[0014] Furthermore, the rotating magnetic field sensor and the traveling wave magnetic field sensor are both circular or square; or the rotating magnetic field sensor and the traveling wave magnetic field sensor are circular and square respectively.

[0015] Furthermore, it also includes an outer shell, and the rotating magnetic field sensor and the traveling wave magnetic field sensor are both arranged in the interlayer of the outer shell.

[0016] Furthermore, a refrigerant interface is provided on the outer shell, and the rotating magnetic field excitation coil and the traveling wave magnetic field excitation coil are both hollow copper tubes and are respectively connected to the refrigerant interface.

[0017] Furthermore, the outer shell is provided with a power supply interface, and the power supply interface is electrically connected to the rotating magnetic field excitation coil and the traveling wave magnetic field excitation coil respectively.

[0018] Furthermore, a lifting interface and an installation interface are respectively provided on the outer shell.

[0019] The above solution of the utility model has the following beneficial effects:

[0020] The utility model provides a composite electromagnetic stirrer suitable for castings of different sizes, with a rotating magnetic field sensor and a traveling wave magnetic field sensor independently and separately arranged. The rotating magnetic field sensor generates a rotating magnetic field when energized, and the traveling wave magnetic field sensor generates a traveling wave magnetic field when energized. The rotating magnetic field sensor and the traveling wave magnetic field sensor are in an upper and lower combination form, and the rotating magnetic field sensor can be placed on the traveling wave magnetic field sensor, or the traveling wave magnetic field sensor can be placed on the rotating magnetic field sensor. The intermediate area adjacent to the rotating magnetic field sensor and the traveling wave magnetic field sensor generates a spiral magnetic field due to the vector superposition of the rotating magnetic field and the traveling wave magnetic field. The above two sensor combinations will induce current in the molten area inside the casting, and the rotating magnetic field sensor placed on the traveling wave magnetic field sensor will generate rotating, spiral, and traveling wave thrust, while the traveling wave magnetic field sensor placed on the rotating magnetic field sensor will generate traveling wave, spiral, and rotating thrust. The rotary thrust accelerates the melt inside the ingot to generate circular flow and increase the kinetic energy of the melt; the spiral thrust deflects and continuously accelerates the direction of movement of the melt; the traveling wave thrust further deflects and continuously accelerates the melt to generate movement along the continuous casting direction, thereby generating a long-distance stirring area in the melt area inside the ingot with flow rate at the center of the ingot and the solidification front.

[0021] The composite electromagnetic stirrer provided by the utility model is suitable for billets of different sizes and can be applied to round or square billets, generates a composite magnetic field of multiple dimensions in the liquid core of the billet, and can adjust the direction and size of the electromagnetic thrust of each dimension in real time according to the process. Its strong penetration can directly affect the central melt, thereby increasing the stirring area and fluidity of the melt inside the billet, improving the temperature uniformity of the melt inside the billet, and improving the solute uniformity of the melt inside the billet. It is a device with high stirring efficiency.

[0022] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the circular composite electromagnetic stirrer of Example 1 of the present utility model (excluding the housing);

[0024] Figure 2 This is a cross-sectional view of the overall structure of the circular composite electromagnetic stirrer according to Example 1 of the present utility model;

[0025] Figure 3 This is a schematic diagram of the overall structure of the rotating magnetic field sensor of Example 1 of the present utility model;

[0026] Figure 4 This is a schematic diagram of the overall structure of the traveling wave magnetic field sensor of Example 1 of the utility model;

[0027] Figure 5 This is a schematic diagram of the overall structure of the square-structured composite electromagnetic stirrer according to Example 2 of the present utility model (excluding the housing);

[0028] Figure 6 This is a cross-sectional view of the overall structure of the square-structured composite electromagnetic stirrer according to Example 2 of the present utility model;

[0029] Figure 7 This is a schematic diagram of the overall structure of the rotating magnetic field sensor of Example 2 of the present utility model;

[0030] Figure 8 This is a schematic diagram of the overall structure of the traveling wave magnetic field sensor of Example 2 of the present utility model;

[0031] Figure 9 This is a streamline diagram of the magnetic field of the composite electromagnetic stirrer of the utility model in the casting billet.

[0032] [Description of Reference Numerals]

[0033] 1-first yoke; 11-first iron core; 2-rotating magnetic field excitation coil; 3-second yoke; 31-second iron core; 4-traveling wave magnetic field excitation coil; 5-connecting iron core; 6-outer shell; 61-refrigerant interface; 62-power interface; 63-hoisting interface; 64-installation interface. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner unless there is any contradiction. For example, different embodiments can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in the present invention will not be described separately.

[0035] It should be noted that the terms "setting" and "connecting" should be understood in a broad sense. For example, they can be directly set, installed, and connected, or they can be indirectly set and connected through a central component or a central structural part. In addition, the orientations or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in the present invention are based on the orientations or positional relationships shown in the drawings or the conventional placement state or usage state. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structural parts, features, devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0036] Example 1

[0037] like Figures 1 to 4 As shown, this embodiment provides a composite electromagnetic stirrer suitable for castings of different sizes, including a rotating magnetic field sensor, a traveling wave magnetic field sensor and an outer shell 6 arranged adjacent to each other along the continuous casting direction of the casting. The rotating magnetic field sensor includes a first choke 1, which is a circular ring. The inner wall of the first choke 1 is evenly provided with six rectangular first iron cores 11. The first iron cores 11 are each wound with a rotating magnetic field excitation coil 2. When the rotating magnetic field excitation coil 2 is passed through an alternating current, a rotating magnetic field is generated, which forms a rotating stirring thrust for the molten steel in the casting.

[0038] The traveling wave magnetic field sensor includes a connecting core 5 and a second choke 3. The connecting core 5 is a circular ring. The two connecting cores 5 are symmetrically arranged up and down. Two second chokes 3 are evenly arranged between the two connecting cores 5 along the circumference direction, that is, the two ends of the second choke 3 are respectively fixedly connected to the ring surface of one of the connecting cores 5. The second choke and the connecting core 5 can be fixed by bolts or welding or integral molding and other common fixing methods, which are not specifically limited here. The inner wall of the second choke 3 is evenly provided with three second cores 31 along the continuous casting direction of the ingot, that is, the second cores 31 are evenly adjacently arranged along the vertical direction of the second choke 3. The second cores 31 are flat and have a curvature consistent with the outer periphery of the connecting core 5. The flat second cores 31 are perpendicular to the second choke 3. Traveling wave magnetic field excitation coils 4 are wound on the second cores 31. The traveling wave magnetic field excitation coils 4 generate a traveling wave magnetic field when alternating current is passed through them.

[0039] In this embodiment, the first yoke 1 and the connecting core 5 are both circular rings, meaning that both the rotating magnetic field sensor and the traveling-wave magnetic field sensor are circular. The outer shell 6 is a hollow ring structure. The rotating magnetic field sensor and the traveling-wave magnetic field sensor are adjacently arranged within the interlayer of the outer shell 6. The outer shell 6 provides support and protection for the rotating magnetic field sensor and the traveling-wave magnetic field sensor, and the billet passes through the middle of the outer shell 6. The rotating magnetic field sensor and the traveling-wave magnetic field sensor are adjacently arranged within the outer shell 6 along the billet continuous casting direction. The rotating magnetic field sensor can be placed above the traveling-wave magnetic field sensor, or the traveling-wave magnetic field sensor can be placed above the rotating magnetic field sensor. The intermediate region between the rotating magnetic field sensor and the traveling-wave magnetic field sensor generates a spiral magnetic field due to the vector superposition of the rotating and traveling-wave magnetic fields. This combination of the two sensors induces current in the melt region within the billet. When the rotating magnetic field sensor is placed above the traveling-wave magnetic field sensor, a rotating, spiral, or traveling-wave thrust is generated. When the traveling-wave magnetic field sensor is placed above the rotating magnetic field sensor, a traveling-wave, spiral, or rotating thrust is generated.

[0040] The rotary thrust accelerates the melt inside the ingot to generate a circular flow and increase the kinetic energy of the melt; the spiral thrust deflects and continuously accelerates the direction of the melt movement; the traveling wave thrust further deflects and continuously accelerates the melt to generate movement along the continuous casting direction, thereby generating a long-distance stirring area in the melt area inside the ingot with flow velocity at the center of the ingot and the solidification front, such as Figure 9 shown.

[0041] Furthermore, the outer shell 6 is provided with a refrigerant interface 61. The rotating magnetic field excitation coil 2 and the traveling wave magnetic field excitation coil 4 are both hollow copper tubes and are respectively connected to the refrigerant interface 61. The refrigerant interface 61 is used to supply cooling medium to the rotating magnetic field excitation coil 2 and the traveling wave magnetic field excitation coil 4 for cooling. The outer shell 6 is also provided with a power supply interface 62. The power supply interface 62 is respectively electrically connected to the rotating magnetic field excitation coil 2 and the traveling wave magnetic field excitation coil 4 to provide power.

[0042] Furthermore, a lifting interface 63 and an installation interface 64 are respectively provided on the outer shell 6. The lifting interface 63 is used to quickly and conveniently connect to the lifting equipment in a detachable manner when installing the composite electromagnetic stirrer provided in this embodiment. The installation interface 64 is a connection interface reserved for use during installation, which is used to install and fix the composite electromagnetic stirrer.

[0043] Example 2

[0044] like Figures 5 to 8 As shown, the structure of the composite electromagnetic stirrer of this embodiment is essentially the same as that of Example 1, with the main differences being that the first yoke 1 is a square ring with four rectangular first iron cores 11 mounted thereon; the connecting iron core 5 is also a square ring, and the second iron core 31 is a flat rectangular shape. In other words, both the rotating magnetic field sensor and the traveling-wave magnetic field sensor are square, and the corresponding outer shell 6 is also square to accommodate these two elements. This structure is better suited for continuous casting of square ingots.

[0045] In other embodiments, the rotating magnetic field sensor and the traveling wave magnetic field sensor, where one is configured as a circle and the other as a square, can also achieve a similar stirring effect as in embodiments 1 and 2.

[0046] In other embodiments, those skilled in the art can flexibly adjust the number of first iron cores 11 according to stirring requirements, and the total number can be greater than or equal to 2; those skilled in the art can also flexibly adjust the number of second yokes 3 and second iron cores 31 according to requirements, and the number of second yokes 3 and second iron cores 31 can be greater than or equal to 2 respectively.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A composite electromagnetic stirrer suitable for castings of different sizes, characterized in that: It includes a rotating magnetic field sensor and a traveling wave magnetic field sensor which are adjacently arranged along the continuous casting direction of the billet; The rotating magnetic field sensor comprises a first choke (1), the first choke (1) being a circular ring or a square ring, the inner wall of the first choke (1) being evenly provided with N rectangular first iron cores (11), and the first iron cores (11) being wound with a rotating magnetic field excitation coil (2) to generate a rotating magnetic field; The traveling wave magnetic field sensor comprises a connecting iron core (5) and a second choke (3), wherein the connecting iron core (5) is a circular ring or a square ring, and the two connecting iron cores (5) are symmetrically arranged in an upper and lower direction, and M second chokes (3) are evenly arranged between the two connecting iron cores (5) along the circumference direction, and the inner wall of the second choke (3) is evenly arranged with m second iron cores (31) along the continuous casting direction of the ingot, and the second iron cores (31) are each wound with a traveling wave magnetic field excitation coil (4) to generate a traveling wave magnetic field; Wherein N, M, and m are all integers greater than or equal to 2.

2. A composite electromagnetic stirrer suitable for castings of different sizes according to claim 1, characterized in that: The rotating magnetic field sensor and the traveling wave magnetic field sensor are both circular or square; or the rotating magnetic field sensor and the traveling wave magnetic field sensor are respectively circular and square.

3. The composite electromagnetic stirrer suitable for castings of different sizes according to claim 1, characterized in that: It also includes an outer shell (6), and the rotating magnetic field sensor and the traveling wave magnetic field sensor are both arranged in the interlayer of the outer shell (6).

4. The composite electromagnetic stirrer suitable for castings of different sizes according to claim 3, characterized in that: A refrigerant interface (61) is provided on the outer shell (6); the rotating magnetic field excitation coil (2) and the traveling wave magnetic field excitation coil (4) are both hollow copper tubes and are respectively connected to the refrigerant interface (61).

5. The composite electromagnetic stirrer suitable for castings of different sizes according to claim 3, characterized in that: The outer shell (6) is also provided with a power supply interface (62), and the power supply interface (62) is electrically connected to the rotating magnetic field excitation coil (2) and the traveling wave magnetic field excitation coil (4) respectively.

6. The composite electromagnetic stirrer suitable for castings of different sizes according to claim 3, characterized in that: The outer shell (6) is also provided with a lifting interface (63) and a mounting interface (64).

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